How to add field to the schedule meeting layout during Convert Lead?

I am looking to add an additional option to schedule meeting. I have added another field (dropdown) in the module meeting which works perfectly in the Meetings page however, I am having great difficulty getting the dropdown to appear in the convert lead section (Schedule Meeting) as an option? Does anyone know how to do this? I am using SugarCE 6.5.18. Thanks for any replies in advance.